<template>
    <div id="aCoursesList" class="bg-fa of">
      <!-- /课程列表 开始 -->
      <section class="container">
        <header class="comm-title">
          <h2 class="fl tac">
            <span class="c-333">全部课程</span>
          </h2>
        </header>
        <section class="c-sort-box">
          <section class="c-s-dl">
            <dl>
              <dt>
                <span class="c-999 fsize14">课程类别</span>
              </dt>
              <dd class="c-s-dl-li">
                <ul class="clearfix">
                  <li>
                    <a title="全部" href="#">全部</a>
                  </li>
                  <li v-for="(item,index) in subjectNestedList" :key="index"  :class="{current:oneIndex==index}">
                    <a :title="item.title" href="#" @click="searchOne(item.id,index)">{{item.title}}</a>
                  </li>
                </ul>
              </dd>
            </dl>
            <dl>
              <dt>
                <span class="c-999 fsize14"></span>
              </dt>
              <dd class="c-s-dl-li">
                <ul class="clearfix">
                  <li v-for="(item,index) in subSubjectList" :key="index" :class="{current:twoIndex==index}">
                    <a :title="item.title" href="#" @click="searchTwo(item.id,index)">{{item.title}}</a>
                  </li>
                </ul>
              </dd>
            </dl>
            <div class="clear"></div>
          </section>
          <div class="js-wrap">
            <section class="fr">
              <span class="c-ccc">
                <i class="c-master f-fM">1</i>/
                <i class="c-666 f-fM">1</i>
              </span>
            </section>
            <section class="fl">
              <ol class="js-tap clearfix">
                <li :class="{'current bg-orange':buyCountSort!=''}">
                  <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">销量
                  <span :class="{hide:buyCountSort==''}">↓</span>
                  </a>
                </li>
                <li :class="{'current bg-orange':gmtCreateSort!=''}">
                  <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">最新
                  <span :class="{hide:gmtCreateSort==''}">↓</span>
                  </a>
                </li>
                <li :class="{'current bg-orange':priceSort!=''}">
                  <a title="价格" href="javascript:void(0);" @click="searchPrice()">价格&nbsp;
                    <span :class="{hide:priceSort==''}">↓</span>
                  </a>
                </li>
              </ol>
            </section>
          </div>
          <div class="mt40">
            <!-- /无数据提示 开始-->
            <section class="no-data-wrap" v-if="data.total ==0">
              <em class="icon30 no-data-ico">&nbsp;</em>
              <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
            </section>
            <!-- /无数据提示 结束-->
            <article v-if="data.total >0" class="comm-course-list">
              <ul class="of" id="bna">
                <li v-for="item in data.items" :key="item.id">
                  <div class="cc-l-wrap">
                    <section class="course-img">
                      <img :src="item.cover" class="img-responsive" :alt="item.title">
                      <div class="cc-mask">
                        <a :href="'/course/'+item.id" :title="item.title" class="comm-btn c-btn-1">开始学习</a>
                      </div>
                    </section>
                    <h3 class="hLh30 txtOf mt10">
                      <a :href="'/course/'+item.id" :title="item.title" class="course-title fsize18 c-333">{{item.title}}</a>
                    </h3>
                    <section class="mt10 hLh20 of">
                      <span v-if="Number(item.price) === 0" class="fr jgTag bg-green">
                        <i  class="c-fff fsize12 f-fA">免费</i>
                      </span>
                      <span class="fl jgAttr c-ccc f-fA">
                        <i class="c-999 f-fA">9634人学习</i>
                        |
                        <i class="c-999 f-fA">9634评论</i>
                      </span>
                    </section>
                  </div>
                </li>
              </ul>
              <div class="clear"></div>
            </article>
          </div>
          <!-- 公共分页 开始 -->
          <div>
            <div class="paging">
              <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
              <a
                :class="{undisable: !data.hasPrevious}"
                href="#"
                title="首页"
                @click.prevent="gotoPage(1)">首</a>
              <a
                :class="{undisable: !data.hasPrevious}"
                href="#"
                title="前一页"
                @click.prevent="gotoPage(data.current-1)">&lt;</a>
              <a
                v-for="page in data.pages"
                :key="page"
                :class="{current: data.current == page, undisable: data.current == page}"
                :title="'第'+page+'页'"
                href="#"
                @click.prevent="gotoPage(page)">{{ page }}</a>
              <a
                :class="{undisable: !data.hasNext}"
                href="#"
                title="后一页"
                @click.prevent="gotoPage(data.current+1)">&gt;</a>
              <a
                :class="{undisable: !data.hasNext}"
                href="#"
                title="末页"
                @click.prevent="gotoPage(data.pages)">末</a>
              <div class="clear"/>
            </div>
          </div>
          <!-- 公共分页 结束 -->
        </section>
      </section>
      <!-- /课程列表 结束 -->
    </div>
  </template>
  <script>
  import courseApi from "@/api/course"
  export default {
    data(){
      return{
        page:1, //当前页
        data:{},//课程列表
        subjectNestedList: [], // 一级分类列表
        subSubjectList: [], // 二级分类列表

        searchObj: {}, // 查询表单对象
        
        oneIndex:-1,
        twoIndex:-1,
        buyCountSort:"",
        gmtCreateSort:"",
        priceSort:""
      }
    },
    created(){
      //课程第一次查询
      this.initCourseFirst()
      //一级分类显示
      this.initSubject()

    },
    methods:{
      //1 查询第一页数据
      initCourseFirst(){
        courseApi.getCourseList(1,8,this.searchObj).then(response =>{
          this.data =response.data.data
        })
      },
      
      //2查询所有分类
      initSubject(){
        courseApi.getAllSubject()
          .then(response => {
            this.subjectNestedList = response.data.data.list
          })
      },
      
      // 3 分页切换的方法
      gotoPage(page){
        courseApi.getCourseList(page,8,this.searchObj).then(response =>{
          this.data =response.data.data
        })
      },

      //4 点击某个一级分类，查询对应的二级分类
      searchOne(subjectParentId,index){
        //把传递index值赋值给oneIndex,为了active样式生效
        this.oneIndex = index

        this.twoIndex = -1
        this.searchObj.subjectId = ""
        this.subSubjectList = []
        
        //把一级分类点击id值，赋值给searchObj
        this.searchObj.subjectParentId = subjectParentId
        //点击某个一级分类进行条件查询
        this.gotoPage(1)


        //拿着点击一级分类id 和 所有一级分类id进行比较
        //如果id相同，从一级分类里面获取对应的二级分类
        for(let i=0;i<this.subjectNestedList.length;i++){
            //获取每个一级分类
            var oneSubject = this.subjectNestedList[i]
            //比较id是否相同
            if(subjectParentId == oneSubject.id){
              //从一级分类里面获取对应的二级分类
              this.subSubjectList = oneSubject.children
            }
        }
      },
      //5 点击某个二级分类实现查询
      searchTwo(subjectId,index){
        //把index赋值，为了样式生效
        this.twoIndex = index
        //把二级分类点击id值，赋值给searchObj
        this.searchObj.subjectId = subjectId
        //点击某个二级分类进行条件查询
        this.gotoPage(1)
      },

      // 根据销量排序
      searchBuyCount(){
        //设置对应变量值，为了样式生效
        this.buyCountSort = "1"
        this.gmtCreateSort = ""
        this.priceSort = ""

        //把值赋值到searchObj
        this.searchObj.buyCountSort = this.buyCountSort
        this.searchObj.gmtCreateSort = this.gmtCreateSort;
        this.searchObj.priceSort = this.priceSort;

        //调用方法查询
        this.gotoPage(1)
      },

      searchGmtCreate(){
        //设置对应变量值，为了样式生效
        this.buyCountSort = ""
        this.gmtCreateSort = "1"
        this.priceSort = ""

        //把值赋值到searchObj
        this.searchObj.buyCountSort = this.buyCountSort
        this.searchObj.gmtCreateSort = this.gmtCreateSort;
        this.searchObj.priceSort = this.priceSort;

        //调用方法查询
        this.gotoPage(1)
      },
      searchPrice(){
        //设置对应变量值，为了样式生效
        this.buyCountSort = ""
        this.gmtCreateSort = ""
        this.priceSort = "1"

        //把值赋值到searchObj
        this.searchObj.buyCountSort = this.buyCountSort
        this.searchObj.gmtCreateSort = this.gmtCreateSort;
        this.searchObj.priceSort = this.priceSort;

        //调用方法查询
        this.gotoPage(1)
      },
    }
  };
  </script>
  <style scoped>
  .active {
    background: #68CB9B;
  }
  .hide {
    display: none;
  }
  .show {
    display: block;
  }
</style>